Speech synthesis method

• US 6,760,703 B2
• Filed: 10/07/2002
• Issued: 07/06/2004
• Est. Priority Date: 12/04/1995
• Status: Expired due to Fees

• Current Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Original Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Inventors: Akamine, Masami, Kagoshima, Takehiko
• Primary Examiner(s): Dorvil, Richemond
• Assistant Examiner(s): Lerner, Martin
• Application Number:
  US10/265,458
• Publication Number:
  US 20030088418A1
• Time in Patent Office: 638 Days
• Field of Search: 704/207, 704/208, 704/219, 704/258, 704/262, 704/268, 704/261, 704/265
• US Class Current: 704/262
• CPC Class Codes: G10L 13/07 Concatenation rules
• CPC Class Codes: G10L 25/90 Pitch determination of speech signals

Abstract

A speech synthesis method that generates a speech pitch wave from a reference speech signal by subjecting the reference speech signal to one of Fourier transform and Fourier series expansion to produce a discrete spectrum, that interpolates the discrete spectrum to generate a consecutive spectrum, and that subjects the consecutive spectrum to inverse Fourier transform. A linear prediction coefficient is generated by subjecting the reference speech signal to a linear prediction analysis. The speech pitch wave is subjected to inverse-filtering based on the linear prediction coefficient to produce a residual pitch wave. Information regarding the residual pitch wave is stored as information of a speech synthesis unit in a voice period. A speech is then synthesized using the information of the speech synthesis unit.

Claims

1. A speech synthesis method comprising:

generating a speech pitch wave from a reference speech signal by subjecting the reference speech signal to one of Fourier transform and Fourier series expansion to produce a discrete spectrum, interpolating the discrete spectrum to generate a consecutive spectrum, and subjecting the consecutive spectrum to inverse Fourier transform;

generating a linear prediction coefficient by subjecting the reference speech signal to a linear prediction analysis;

subjecting the speech pitch wave to inverse-filtering based on the linear prediction coefficient to produce a residual pitch wave;

storing information regarding the residual pitch wave as information of a speech synthesis unit in a voiced period; and

synthesizing a speech, using the information of the speech synthesis unit.

2. The speech synthesis method according to claim 1, wherein subjecting the speech pitch wave to inverse-filtering includes filtering the speech pitch wave through a linear prediction inverse filter having characteristics determined in accordance with the linear prediction coefficient to generate the residual pitch wave.

3. The speech synthesis method according to claim 1, wherein in subjecting the speech pitch wave to inverse-filtering the linear prediction coefficient is used as a spectrum parameter.